Cast chilled reamer



J. A. SHERMAN.

CAST GHILLED REAMER No. 399,849. Patented Mar. 12, 1889.

K Fla 3.

JAMES A. SHERMAN, OF

PATENT OFFICE.

BUFFALO, NElV YORK.

CAST CHILLED REAMER.

SPECIFICATION forming part of Letters Patent No. 399,349, dated March 12, 1889.

Application filed n ry 2, 1839.

To all 1071/0722 it may concern..-

Be it known that I, JAMES A. SHERMAN, of Bullalo, in the county of Erie and State of New York, have in vented certain new and useful Improvements in Cast-Iron Chilled Reamers; and I do hereby declare that the following description of: my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has general reference to improvements in cast-iron reamers for boring car-wheels, &c.; and it consists, essentially, in the method of producing the same, ashoreinatter first fully set forth and described, and then pointed out in the claims.

In the drawings already referred to, which l serve to illustrate my said invention more 5 fully, Figure l is an elevation of a reamer constructed in accordance with myinvention. y Fig. 2 is a bottom plan and Fig. 3 a top view of the same. Fig.4 isalongitudinal sectional I elevation in line a: a: of Fig. 3.

Like parts are designated by corresponding l letters of reference in allthe figures. The object of my invention is the production of a cheap reamer especially designed for use in boring-machines for boring the hubs i of car-wheels, butalso applicable for all other i purposes where a reamer can be employed. To attain the result described,I produce thes reamers of all the various sizes in the proce. of casting in socalled chills of iron of a very close grain, whereby I at once obtain the correct shape of the tool and at the same time the requisite hardness to accomplish the object in view, so that when the cutting-edges g of the reainer are trued up by first revolving the reamer upon a suitable mandrel in a machine adapted for such purpose, and then grinding the cutting-faces by means of an emery wheel to the. correct: diameter, and finally relieving the same to give the neeessary rake or clearance, I produce an article I Serial No. 296,130. 1N0 modelwhich for cheapness of cost cannot be excelled by any other method of construction, while for durability it will compare favorably with reainers of the best tool or crucible steel. In casting these reamers I prefer to form the body A with a taper aperture, B, and to arrange recesses C in the upper face, said recesscs serving as drivers in conjunction with a suitable mandrel. (Not shown.) I also prefor to round off the cutting-points D, as shown in I igs. 1,2, and and to so grind them that all the cutting-points will act simultaneously. I have used these reamers for some time for boring the hubs of chilled can wheels, and find them to answer all the purposes and requirements of such work as well as any, while I have been. able to produce them at a cost less than what the steel of a reamer as now made would cost.

Having thus fully described my 1nvent1on,I claim as new and desire to secure to me by Letters Patent of the United Stntes- 1. As an improved article of manufacture,

a cast-iron chilled reamer for iron working having a body provided with longitudinallyprojeetiug cutting-teeth the edges of which are ground sharp along the advance edges and the botton'l thereof, an interior bore, and recesses in its face, as and [or the purpose set forth.

2. The cast-iron chilled reamer hereinbefore described, consisting of the body A,having the taper bore 3, the oppositelylocated ecesses C in the face. of said body, and the laterally-projecti11g cutting-lips D, the latter being provided with the rounded cuttingedges E, relieved in the manner as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have hereto setmy hand in the presmice of two subscribing witnesses.

JAB. A. SHERMAN.

Attesi:

)[ICHAEL J'. S'raru, Gno. 0. Boom. 

